introduce instance manager

src/main/java/de/marhali/easyi18n/InstanceManager.java

@@ -0,0 +1,74 @@
+package de.marhali.easyi18n;
+
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.project.Project;
+
+import de.marhali.easyi18n.model.TranslationUpdate;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+import java.util.WeakHashMap;
+
+/**
+ * Central singleton component for managing an easy-i18n instance for a specific project.
+ * @author marhali
+ */
+public class InstanceManager {
+
+    private static final Map<Project, InstanceManager> INSTANCES = new WeakHashMap<>();
+
+    private final DataStore store;
+    private final DataBus bus;
+
+    public static InstanceManager get(@NotNull Project project) {
+        InstanceManager instance = INSTANCES.get(project);
+
+        if(instance == null){
+            instance = new InstanceManager(project);
+            INSTANCES.put(project, instance);
+        }
+
+        return instance;
+    }
+
+    private InstanceManager(@NotNull Project project) {
+        this.store = new DataStore(project);
+        this.bus = new DataBus();
+
+        // Load data after first initialization
+        ApplicationManager.getApplication().invokeLater(() -> {
+            this.store.loadFromPersistenceLayer((success) -> {
+                this.bus.propagate().onUpdateData(this.store.getData());
+            });
+        });
+    }
+
+    public DataStore store() {
+        return this.store;
+    }
+
+    public DataBus bus() {
+        return this.bus;
+    }
+
+    public void processUpdate(TranslationUpdate update) {
+        if(update.isDeletion() || update.isKeyChange()) { // Remove origin translation
+            this.store.getData().setTranslation(update.getOrigin().getKey(), null);
+        }
+
+        if(!update.isDeletion()) { // Create or re-create translation with changed data
+            this.store.getData().setTranslation(update.getChange().getKey(), update.getChange().getTranslation());
+        }
+
+        this.store.saveToPersistenceLayer(success -> {
+            if(success) {
+                this.bus.propagate().onUpdateData(this.store.getData());
+
+                if(!update.isDeletion()) { // TODO: maybe focus parent if key was deleted
+                    this.bus.propagate().onFocusKey(update.getChange().getKey());
+                }
+            }
+        });
+    }
+}